45 



THE APPLE-SNAILS OF SIAM. 



ADDENDUM. 



, Pachylabra winkleyi (Pilsbry). 



1901. Ampullaria Winkleyi, Pilsbry, Proc. Ac. Nat. Sci. Phila- 

 delphia, LIII, p. 189, pl.V, figs. 2, 3. 



Since I corrected the proofs of this paper I have discovered 

 an interesting specimen from my own Tale Sap collection that had 

 been temporarily mislaid. It agrees very closely, except in being 

 considerably smaller, with Pilsbry's figure of this species, differing 

 from L. begini in the well-marked flatness of the whorls outside 

 the suture and in the very fine, minutely granular transverse striae. 

 The external surface is pale olivaceous with occasional, irregular 

 black longitudinal streaks. The inside of the lip is yellowish but 

 the margin white. 



It is evident that I was wrong in identifying the form 

 common in the Southern Shan States (Pec. hid. Mus., XIV, p. 

 138; 1918J with P. winkleyi. It can hardly be distinguished 

 from P. maura (Reeve), which is certainly not more than an 

 eastern local race of P. globosa (Swainson), the species common in 

 the Ganges valley. 



P. winkleyi was originally described from Henzada in Pegu 

 and has not hitherto been recorded from Siam. 



N. AXXANDALE. 



JORUN. NAT. HIST. SOC. SIAM. VOL. IV, NO. 1, 1920. 



